/* ===== 全局重置与基础 ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  font-size: 16px;
}
body {
  font-family: 'Inter', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  color: #111827;
  background-color: #fff;
  line-height: 1.7;
}
a {
  text-decoration: none;
  color: inherit;
}
ul, ol {
  list-style: none;
}
img {
  max-width: 100%;
  display: block;
}

/* ===== 布局容器 ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 30px;
}

/* ===== Header ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: #fff;
  border-bottom: 1px solid #E5E7EB;
  height: 64px;
  display: flex;
  align-items: center;
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}
.header-logo {
  display: flex;
  align-items: center;
  gap: 10px;
}
.header-logo img {
  height: 48px;
  width: auto;
}
.header-nav {
  display: flex;
  align-items: center;
  gap: 36px;
}
.header-nav a {
  font-size: 15px;
  color: #374151;
  font-weight: 500;
  transition: color 0.2s;
}
.header-nav a:hover {
  color: #E5A414;
}

/* ===== Dropdown Menu ===== */
.nav-item { position: relative; display: flex; align-items: center; }
.nav-link { font-size: 15px; color: #374151; font-weight: 500; transition: color 0.2s; cursor: pointer; display: flex; align-items: center; gap: 3px; user-select: none; }
.nav-item:hover .nav-link { color: #E5A414; }
.dropdown-arrow { font-size: 11px; display: inline-block; transition: transform 0.2s; }
.nav-item:hover .dropdown-arrow,
.nav-item.open .dropdown-arrow { transform: rotate(180deg); }
.dropdown-menu {
  position: absolute;
  top: calc(100% + 16px);
  left: 50%;
  transform: translateX(-50%) translateY(-6px);
  background: #fff;
  border: 1px solid #E5E7EB;
  border-radius: 8px;
  box-shadow: 0 8px 28px rgba(0,0,0,0.12);
  min-width: 160px;
  padding: 6px 0;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s, transform 0.2s, visibility 0.2s;
  z-index: 200;
}
.dropdown-menu::before {
  content: '';
  position: absolute;
  top: -6px; left: 50%;
  transform: translateX(-50%);
  border: 6px solid transparent;
  border-top: 0;
  border-bottom-color: #E5E7EB;
}
.dropdown-menu::after {
  content: '';
  position: absolute;
  top: -5px; left: 50%;
  transform: translateX(-50%);
  border: 6px solid transparent;
  border-top: 0;
  border-bottom-color: #fff;
}
.nav-item:hover .dropdown-menu { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }
.dropdown-menu a { display: block; padding: 9px 20px; font-size: 14px; color: #374151; font-weight: 400; white-space: nowrap; transition: background 0.15s, color 0.15s; }
.dropdown-menu a:hover { background: #F8FAFC; color: #E5A414; }
.dropdown-menu .dropdown-all { border-top: 1px solid #E5E7EB; margin-top: 4px; padding-top: 10px; color: #E5A414; font-weight: 500; }
.dropdown-menu .dropdown-all:hover { background: rgba(229,164,20,0.06); }

.header-cta {
  display: flex;
  align-items: center;
  gap: 12px;
}
.btn {
  display: inline-block;
  padding: 10px 24px;
  border-radius: 6px;
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
  text-align: center;
}
.btn-primary {
  background-color: #0069EC;
  color: #fff;
}
.btn-primary:hover {
  background-color: #0056c7;
  box-shadow: 0 4px 12px rgba(0, 105, 236, 0.3);
}
.btn-outline {
  background-color: transparent;
  color: #0069EC;
  border: 1.5px solid #0069EC;
}
.btn-outline:hover {
  background-color: #f0f6ff;
}
.btn-white {
  background-color: #fff;
  color: #0069EC;
  font-weight: 600;
}
.btn-white:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* ===== Hero Section ===== */
.hero {
  margin-top: 64px;
  min-height: 420px;
  background-image: url('https://www.dkmeco.com/img/docuSign/docu-sign-bannar.png');
  background-size: cover;
  background-position: center;
  background-color: #0c3d8c;
  display: flex;
  align-items: center;
  padding: 80px 0;
}
.hero-content {
  max-width: 640px;
}
.hero-label {
  display: inline-block;
  background: rgba(255,255,255,0.15);
  color: #fff;
  font-size: 13px;
  font-weight: 500;
  padding: 4px 12px;
  border-radius: 20px;
  margin-bottom: 20px;
  border: 1px solid rgba(255,255,255,0.3);
}
.hero-title {
  font-size: 52px;
  font-weight: 700;
  color: #fff;
  line-height: 1.15;
  margin-bottom: 20px;
}
.hero-subtitle {
  font-size: 18px;
  color: rgba(255,255,255,0.9);
  line-height: 1.7;
  margin-bottom: 36px;
}
.hero-actions {
  display: flex;
  gap: 16px;
  align-items: center;
  flex-wrap: wrap;
}
.hero-actions .btn {
  padding: 13px 32px;
  font-size: 16px;
}
.hero-actions .btn-lime {
  background-color: #D4FF00;
  color: #0069EC;
  font-weight: 700;
}
.hero-actions .btn-lime:hover {
  box-shadow: 0 4px 16px rgba(212, 255, 0, 0.4);
}

/* ===== 数据指标带 ===== */
.stats-bar {
  background-color: #F8FAFC;
  border-bottom: 1px solid #E5E7EB;
  padding: 36px 0;
}
.stats-bar .container {
  display: flex;
  justify-content: space-around;
  align-items: center;
  flex-wrap: wrap;
  gap: 24px;
}
.stat-item {
  text-align: center;
}
.stat-item .stat-value {
  font-size: 40px;
  font-weight: 700;
  color: #0069EC;
  line-height: 1.1;
}
.stat-item .stat-label {
  font-size: 14px;
  color: #6B7280;
  margin-top: 4px;
}

/* ===== Section 通用 ===== */
.section {
  padding: 80px 0;
}
.section.bg-gray {
  background-color: #F8FAFC;
}
.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 60px;
}
.section-header .section-label {
  font-size: 13px;
  font-weight: 600;
  color: #0069EC;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 12px;
}
.section-header h2 {
  font-size: 36px;
  font-weight: 700;
  line-height: 1.25;
  color: #111827;
  margin-bottom: 16px;
}
.section-header p {
  font-size: 17px;
  color: #6B7280;
  line-height: 1.7;
}

/* ===== 左右分栏模块 ===== */
.feature-row {
  display: flex;
  align-items: center;
  gap: 72px;
}
.feature-row.reverse {
  flex-direction: row-reverse;
}
.feature-row + .feature-row {
  margin-top: 80px;
}
.feature-image {
  flex: 0 0 540px;
}
.feature-image img {
  width: 100%;
  border-radius: 12px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.10);
}
.feature-text {
  flex: 1;
}
.feature-text .tag {
  display: inline-block;
  background: #EFF6FF;
  color: #0069EC;
  font-size: 13px;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 4px;
  margin-bottom: 16px;
}
.feature-text h3 {
  font-size: 28px;
  font-weight: 700;
  line-height: 1.3;
  color: #111827;
  margin-bottom: 16px;
}
.feature-text p {
  font-size: 16px;
  color: #4B5563;
  line-height: 1.75;
  margin-bottom: 16px;
}
.feature-text .feature-points {
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.feature-text .feature-points li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 15px;
  color: #374151;
}
.feature-text .feature-points li::before {
  content: '';
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  margin-top: 3px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='%230069EC'%3E%3Cpath fill-rule='evenodd' d='M10 18a8 8 0 100-16 8 8 0 000 16zm3.707-9.293a1 1 0 00-1.414-1.414L9 10.586 7.707 9.293a1 1 0 00-1.414 1.414l2 2a1 1 0 001.414 0l4-4z' clip-rule='evenodd'/%3E%3C/svg%3E");
  background-size: contain;
}
.feature-text .btn-link {
  margin-top: 28px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 15px;
  font-weight: 600;
  color: #0069EC;
}
.feature-text .btn-link:hover {
  text-decoration: underline;
}

/* ===== 价值主张卡片 ===== */
.value-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.value-card {
  background: #fff;
  border: 1px solid #E5E7EB;
  border-radius: 12px;
  padding: 36px 28px;
  transition: box-shadow 0.2s, transform 0.2s;
}
.value-card:hover {
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
  transform: translateY(-2px);
}
.value-card .card-icon {
  width: 48px;
  height: 48px;
  background: #EFF6FF;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}
.value-card .card-icon svg {
  width: 26px;
  height: 26px;
}
.value-card h3 {
  font-size: 20px;
  font-weight: 600;
  color: #111827;
  margin-bottom: 10px;
}
.value-card p {
  font-size: 15px;
  color: #6B7280;
  line-height: 1.65;
}

/* ===== 集成 ===== */
.integration-intro {
  text-align: center;
  font-size: 17px;
  color: #4B5563;
  max-width: 660px;
  margin: 0 auto 48px;
}
.integration-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 860px;
  margin: 0 auto;
}
.integration-item {
  background: #fff;
  border: 1px solid #E5E7EB;
  border-radius: 10px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  transition: box-shadow 0.2s;
}
.integration-item:hover {
  box-shadow: 0 4px 16px rgba(0,0,0,0.08);
}
.integration-item img {
  max-height: 36px;
  width: auto;
  margin: 0 auto;
}
.integration-count {
  text-align: center;
  margin-top: 32px;
  font-size: 15px;
  color: #6B7280;
}
.integration-count strong {
  color: #0069EC;
  font-size: 22px;
  font-weight: 700;
}

/* ===== 品牌客户 ===== */
.brand-section {
  background-color: #48455E;
  padding: 60px 0;
  text-align: center;
}
.brand-section h2 {
  font-size: 26px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 40px;
}
.brand-logos {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 40px 64px;
}
.brand-logos img {
  height: 36px;
  width: auto;
  filter: brightness(0) invert(1);
  opacity: 0.75;
  transition: opacity 0.2s;
}
.brand-logos img:hover {
  opacity: 1;
}

/* ===== 信任指标 ===== */
.trust-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}
.trust-item {
  text-align: center;
  padding: 36px 20px;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 2px 16px rgba(0,0,0,0.06);
}
.trust-item .trust-icon {
  width: 52px;
  height: 52px;
  margin: 0 auto 16px;
}
.trust-item .trust-icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.trust-item .trust-value {
  font-size: 32px;
  font-weight: 700;
  color: #0069EC;
  line-height: 1.1;
  margin-bottom: 8px;
}
.trust-item .trust-name {
  font-size: 16px;
  font-weight: 600;
  color: #111827;
  margin-bottom: 6px;
}
.trust-item .trust-detail {
  font-size: 14px;
  color: #6B7280;
}

/* ===== 客户证言 ===== */
.testimony-section {
  background: linear-gradient(135deg, #0c3d8c 0%, #0069EC 100%);
  padding: 80px 0;
}
.testimony-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}
.testimony-content .quote-mark {
  font-size: 72px;
  color: rgba(255,255,255,0.25);
  line-height: 0.5;
  margin-bottom: 24px;
}
.testimony-content .quote-text {
  font-size: 20px;
  color: #fff;
  line-height: 1.7;
  font-style: italic;
}
.testimony-content .quote-person {
  margin-top: 28px;
  font-size: 15px;
  color: rgba(255,255,255,0.75);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}
.testimony-content .quote-person::before {
  content: '';
  display: block;
  width: 32px;
  height: 1px;
  background: rgba(255,255,255,0.5);
}

/* ===== 底部 CTA ===== */
.bottom-cta {
  background-color: #E5A414;
  padding: 80px 0;
  text-align: center;
}
.bottom-cta h2 {
  font-size: 38px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
}
.bottom-cta p {
  font-size: 18px;
  color: rgba(255,255,255,0.9);
  margin-bottom: 36px;
}
.bottom-cta .cta-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}
.bottom-cta .btn {
  padding: 14px 36px;
  font-size: 16px;
}
.btn-white-outline {
  background: transparent;
  color: #fff;
  border: 2px solid rgba(255,255,255,0.7);
}
.btn-white-outline:hover {
  background: rgba(255,255,255,0.1);
}

/* ===== Footer ===== */
.site-footer {
  background-color: #1F2937;
  padding: 48px 0 28px;
  color: #9CA3AF;
}
.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 40px;
  padding-bottom: 36px;
  border-bottom: 1px solid #374151;
}
.footer-brand img {
  height: 28px;
  width: auto;
  margin-bottom: 12px;
  filter: brightness(0) invert(1);
  opacity: 0.8;
}
.footer-brand p {
  font-size: 14px;
  color: #9CA3AF;
  max-width: 240px;
  line-height: 1.6;
}
.footer-links {
  display: flex;
  gap: 64px;
}
.footer-col h4 {
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 16px;
}
.footer-col ul li {
  margin-bottom: 10px;
}
.footer-col ul li a {
  font-size: 14px;
  color: #9CA3AF;
  transition: color 0.2s;
}
.footer-col ul li a:hover {
  color: #fff;
}
.footer-contact {
  font-size: 14px;
  color: #9CA3AF;
}
.footer-contact p {
  margin-bottom: 6px;
}
.footer-contact strong {
  color: #D1D5DB;
}
.footer-bottom {
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom p {
  font-size: 13px;
  color: #6B7280;
}
.footer-bottom a {
  color: #6B7280;
  transition: color 0.2s;
}
.footer-bottom a:hover {
  color: #9CA3AF;
}

/* ===== 自动化协议区块 ===== */
.automation-block {
  display: flex;
  align-items: center;
  gap: 64px;
  background: #F8FAFC;
  border-radius: 16px;
  overflow: hidden;
  padding: 0;
}
.automation-block img {
  flex: 0 0 520px;
  width: 520px;
  height: 320px;
  object-fit: cover;
  display: block;
}
.automation-text {
  flex: 1;
  padding: 40px 48px 40px 0;
}
.automation-text h3 {
  font-size: 26px;
  font-weight: 700;
  color: #111827;
  line-height: 1.35;
  margin-bottom: 16px;
}
.automation-text p {
  font-size: 16px;
  color: #4B5563;
  line-height: 1.75;
  margin-bottom: 28px;
}

/* ===== 视频区块 ===== */
.video-wrap {
  max-width: 800px;
  margin: 0 auto;
}
.video-wrap video {
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: 12px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
  display: block;
  background: #000;
}

/* ===== 手机汉堡菜单按钮 ===== */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: #374151;
  border-radius: 2px;
  transition: all 0.2s;
}

/* ===== 响应式 ===== */

/* Laptop: 1025–1200px */
@media (max-width: 1200px) {
  .feature-image {
    flex: 0 0 420px;
  }
  .feature-row {
    gap: 48px;
  }
}

/* Tablet 横屏: 901–1024px */
@media (max-width: 1024px) {
  .feature-image {
    flex: 0 0 380px;
  }
  .feature-row {
    gap: 36px;
  }
  .trust-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .automation-block img {
    flex: 0 0 380px;
    width: 380px;
    height: 260px;
  }
}

/* Tablet 竖屏: 769–900px，feature 改单列 */
@media (max-width: 900px) {
  .feature-row,
  .feature-row.reverse {
    flex-direction: column;
    gap: 28px;
  }
  .feature-image {
    flex: 0 0 auto;
    width: 100%;
  }
  .section {
    padding: 60px 0;
  }
  .section-header {
    margin-bottom: 40px;
  }
  .hero {
    padding: 60px 0;
  }
  .testimony-section {
    padding: 60px 0;
  }
  .bottom-cta {
    padding: 60px 0;
  }
  .automation-block {
    flex-direction: column;
    gap: 0;
  }
  .automation-block img {
    flex: 0 0 auto;
    width: 100%;
    height: 240px;
  }
  .automation-text {
    padding: 28px 28px;
  }
}

/* Mobile: ≤768px */
@media (max-width: 768px) {
  .header-nav {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: #fff;
    border-top: 1px solid #E5E7EB;
    flex-direction: column;
    padding: 16px 20px;
    gap: 0;
    box-shadow: 0 8px 24px rgba(0,0,0,0.1);
  }
  .header-nav.open {
    display: flex;
  }
  .header-nav > a {
    padding: 12px 0;
    border-bottom: 1px solid #F3F4F6;
    width: 100%;
    display: block;
  }
  .header-cta .btn-outline {
    display: none;
  }
  .nav-toggle {
    display: flex;
  }

  /* 移动端下拉 */
  .nav-item { width: 100%; flex-direction: column; align-items: flex-start; border-bottom: 1px solid #F3F4F6; }
  .nav-link { padding: 12px 0; width: 100%; justify-content: space-between; }
  .nav-item:hover .nav-link { color: #374151; }
  .nav-item:hover .dropdown-menu { opacity: 1; visibility: visible; transform: none; }
  .dropdown-menu { position: static; opacity: 1; visibility: visible; transform: none; box-shadow: none; border: none; border-radius: 0; padding: 0 0 8px 0; min-width: 0; width: 100%; display: none; }
  .dropdown-menu::before, .dropdown-menu::after { display: none; }
  .nav-item.open > .nav-link { color: #E5A414; }
  .nav-item.open .dropdown-menu { display: block; }
  .dropdown-menu a { padding: 9px 12px; border-bottom: none; color: #6B7280; }
  .dropdown-menu a:hover { background: none; color: #E5A414; }
  .dropdown-menu .dropdown-all { border-top: none; margin-top: 0; }

  .hero {
    padding: 48px 0 56px;
  }
  .hero-title {
    font-size: 30px;
  }
  .hero-subtitle {
    font-size: 15px;
    margin-bottom: 28px;
  }

  .section {
    padding: 56px 0;
  }
  .section-header {
    margin-bottom: 36px;
  }
  .section-header h2 {
    font-size: 26px;
  }
  .section-header p {
    font-size: 15px;
  }

  .value-cards {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .integration-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }
  .integration-item {
    height: 68px;
  }

  .trust-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .brand-logos {
    gap: 24px 32px;
  }
  .brand-logos img {
    height: 26px;
  }

  .testimony-section {
    padding: 56px 0;
  }
  .testimony-content .quote-text {
    font-size: 16px;
  }

  .bottom-cta {
    padding: 56px 0;
  }
  .bottom-cta h2 {
    font-size: 26px;
  }
  .bottom-cta p {
    font-size: 15px;
  }

  .footer-top {
    flex-direction: column;
  }
  .footer-links {
    gap: 24px;
    flex-wrap: wrap;
  }

  .stats-bar {
    padding: 28px 0;
  }
  .stats-bar .container {
    gap: 20px 32px;
  }
  .stat-item .stat-value {
    font-size: 28px;
  }

  .automation-block img {
    height: 200px;
  }
  .automation-text {
    padding: 24px 20px;
  }
  .automation-text h3 {
    font-size: 22px;
  }

  .video-wrap video {
    border-radius: 8px;
  }
}

/* Small Mobile: ≤480px */
@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }
  .hero {
    padding: 40px 0 48px;
  }
  .hero-title {
    font-size: 26px;
  }
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }
  .hero-actions .btn {
    text-align: center;
  }
  .trust-grid {
    grid-template-columns: 1fr;
  }
  .footer-links {
    flex-direction: column;
    gap: 20px;
  }
  .bottom-cta .cta-actions {
    flex-direction: column;
  }
  .feature-text h3 {
    font-size: 22px;
  }
  .value-card {
    padding: 24px 20px;
  }
  .stats-bar .container {
    grid-template-columns: repeat(2, 1fr);
    display: grid;
    gap: 20px;
  }
  .stat-item .stat-value {
    font-size: 26px;
  }
}